/* ***** BEGIN LICENSE BLOCK *****
 *   Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is JsWs.
 *
 * The Initial Developer of the Original Code is
 * Chris Winberry.
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * 
 * ***** END LICENSE BLOCK ***** */

/**
 * @class Class to handle encoding/decoding of URL formatted name/value pairs
 * @constructor
 * @param {String} encodedData (optional) URL encoded string
 */
function Querystring (encodedData) {
	this.parse((encodedData == null) ? "" : encodedData.toString());
}


/**
 * Serializer
 * @type String
 */
Querystring.prototype.toString = function () {
	var result = "";
	for (var key in this) {
		if (typeof this[key] != "function")
			result += (result.length ? "&" : "")
				+ escape(key)
				+ ((this[key] != "") ? ("=" + escape(this[key])) : "");
	}
	return(result);
}


/**
 * Parses a URL encoded string, breaking it up into a Hash
 * @param {String} data URL encoded string
 */
Querystring.prototype.parse = function (data) {
	if (data == null)
		return;
	var queryParts = data.split("&");
	for (var i = 0; i < queryParts.length; i++) {
		if (!queryParts[i].length) { continue; }
		var parameterParts = queryParts[i].split("=");
		if (parameterParts.length == 1) { parameterParts[1] = ""; }
		this[unescape(parameterParts.shift())] = unescape(parameterParts.join('='));
	}
}


/**
 * Provides a list of existing keys (names)
 * @returns Array of keys (names)
 * @type String[]
 */
Querystring.prototype.GetKeys = function () {
	var results = new Array();
	for (var key in this)
		if (typeof this[key] != "function")
			results[results.length] = key;
	return(results);
}

